And actually, this is both a cause for hope and a cause for concern.
The Ozone hole happened because of the use of CFCs and other materials. Concerted action globally by national governments has made a significant impact on the level of such pollutants in the environment (although it may take quite a while for the ones already released to disapear). So such change is possible.
The concern? As levels of CFCs diminish, and the ozone hole shrinks, it may exascerbate the effects of global warming, and given the amount of ice locked up down ther, the shit really could hit the fan.
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